Lab 7
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Eastfield College *
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1401
Subject
Geography
Date
Dec 6, 2023
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docx
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What is a Tsunami?
1.
Do tsunamis radiate in only a single direction? (explain)
Tsunamis don’t radiate in only a single direction;
tsunamis radiate outwards in all directions from its
source and can move across entire oceans in less
than a day.
2.
How does the depth of the water influence a tsunami?
(explain)
The depth of the water influences how a tsunami
reacts. In shallow waters it slows down the deeper
the water the higher the speeds.
3.
How are all tsunamis basically the same? (explain)
Tsunamis are not all the same although the cause
of tsunamis are caused by the displacement of a
large capacity of water.
4.
What happens as a tsunami wave approaches the shore?
(explain)
When a tsunami approaches the shore it slows
down, the wavelength decreases and heigh
increases.
5.
What is a general time lapse between successive tsunami
waves?
The time lapse between tsunami waves ranges
from five minutes to two hours.
6.
Watch the 5:46 minute video on the 2011 Tohoku Tsunami
and briefly explain your reaction.
Watching the video on the 2011 Tohoku Tsunami
was shocking and insane how the power of water
can destroy multiple cities.
7.
Which wave was the largest wave in the Tohoku tsunami
and in the 1964 Alaskan earthquakes?
The largest wave in Tohoku tsunami was 130 ft and
in the Alaskan 1964 tsunami was 100ft tall.
Local and Distant Tsunami
1.
What exactly is a local tsunami?
A local tsunami is when the source is less than an
hour tsunami travel from the impacted location.
What exactly is a distant tsunami?
A distant tsunami is from a faraway source, up to
three hours from the area of interest.
2.
Why are local tsunamis more of an issue to life?
Local Tsunamis are the most dangerous as it’s the
most damaging and it allows little to no time to
issue official warnings and evacuate.
What causes tsunamis?
1.
What causes tsunamis (list several possible causes)
Earthquakes that occur under the ocean or neat
shorelines.
Volcanic activity
Landslides
Near earth objects
2.
What characteristics determine whether an earthquake
will cause a tsunami?
The characteristics that determine whether an
earthquake will cause a tsunami is the Magnitude,
the depth, and the location in reaction to the ocean
floor.
3.
What are the 3 general factors that cause earthquakes to
generate tsunamis?
3 factors that cause earthquakes to generate
tsunamis are large fault motion, movement on the
ocean floor and under water landslides.
4.
Explain about tsunamis and their connection to
landslides, volcanic eruptions, bolide impacts, weather,
and seiche waves.
Landslides can cause a tsunami by its displacement
of large amounts of water, Volcanic eruptions and
bolide impacts cause large waves, weather such as
hurricanes cause storm surges that lead to floods
and tsunamis and seiche waves can lead to the
formation of a tusunami.
5.
Watch the 1:09 minute video on seiche waves in a
swimming pool and give your reaction.
Watching the video on seiche waves in a swimming
pool is amusing as to how an enclosed body of
water can also be impacted by a tsunami.
6.
What would a seiche wave do to a dam with a large lake?
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A seiche wave could damage the structure of the wall
or even flood downstream.
Tsunamis in Washington Icon
1.
Describe the 4 main types of tsunami risks, where are
they of greatest impact, and how much time is needed to
evaluate each type.
Distant: area of greatest impact Pacific coastal
communities an hour is needed to evacuate.
Cascadia subduction zone: area of greatest impact
pacific coastal communities and tens of minutes is
needed to evacuate.
Local Earthquake: Communities close to the body
of water, minutes to tens of minutes are needed to
evacuate.
Landslide-caused tsunami the area of greatest
impact depends on where the landslides occur,
minutes to tens of minutes is the time to evacuate.
Preparedness and Evacuation
Icon
1.
What are 6 ways you can be or may become aware a
tsunami is coming?
Hearing a tsunami warning siren or receive an
alert.
Feel a strong earthquake near the ocean or large
lake.
Notice a very large wave approaching.
See coastal waters recede. As the tsunami
approaches sometimes seal level will drop rapidly
as the wave gets taller.
Notice an unusually rapid rise in sea level.
Notice a landslide that falls or slides into the
ocean.
Tsunami Simulation Video Icon
1.
What are the 10 things you learned from the simulation?
I learned:
That the simulator can be used to evaluate
whether differences.
It can also evaluate flood defenses that are
effective against tsunamis.
It a good to study the tusunami as a whole.
Viewing the stimulators also show the speed its
going and what locations are being impacted.
That the stimulator itself shows the wave
amplitude
You can also see the time that the earthquake has
passed.
The stimulator is a great tool to use if your studing
the impact of the tsunamis or just want to learn
more about the depths of tsunamis
Tsunami Alerts Icon
1.
Once a tsunami has been created, what is the general
range of time delay before it finally reaches land?
There’s usually a delay of several minutes to hours
before it reaches land.
2.
How do scientists suspect a tsunami has potentially been
formed?
Scientists use network of ocean sensors to detect
and monitor tsunamis.
3.
What can scientists use to make this determination?
Scientist can use open ocean buoys and coastal
tide gauges to make determinations.
4.
What do you call the Tsunami Warning Center in
Washington State?
National Tsunami Warning Center(NTWC)
5.
What information is provided specifically by the
monitoring networks?
The information provided specifically by the
monitoring networks is water-level seismic network,
and coastal water-level
6.
Exactly what is DART?
Deep-ocean Assessment and Reporting of Tsunami
stations at sites in regions with a history of
generating destructive Tsunamis.
7.
Explain the tsunami alert system inclusive of names,
actions, and potential hazards.
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The tsunami alert system warns people of the
severity of a tsunami and actions that need to be
taken such as;
A RED is a Tsunami warning: the action is to seek
high grounds and potential hazard is DANGER!
wave height>3ft
An ORANGE is a Tsunami Advisory: stay out of
water and away from shore the potential hazard
Strong currents ands dangerous waves.
A YELLOW is a Tsunami Watch: is watch the action
is be prepares potential hazard is Tsunami is
Possible.
A Green is information statements no action need,
and the potential hazard is No Tsunami impact
expected.
Historical Tsunamis Worldwide
1.
What
is
the largest known tsunami in history?
The Lituya Bay
2.
How exactly was it caused and how big was it?
It was caused by earthquake triggered landslide, it
was 1,720 feet tall.
3.
What predicated the formation of the Pacific Tsunami
Warning Center?
The Aleutian Islands Tsunami from Alaska that
killed 159 people in Hawaii.
4.
What was unusual about the All-Saint’s Day Nov. 1, 1755
tsunami?
It was the first natural disaster in modern day
history to be discusses as a physical phenomenon.
5.
What was unusual about the Cascadia Jan. 26, 1700
tsunami?
This Tsunami created during this event is record
and in Native American oral history.
Its earthquake was so far away it was not felt.
6.
What was the death count in the Indian Ocean Dec. 26,
2004 tsunami and why did some many people suffer?
The death count in the Indian Ocean was nearly
280,000 deaths a lot of people suffered due to the
lack of tsunami warning systems. People didn’t
know to evacuate.
7.
What was unusual in Krakatoa Aug. 26-27 1883 eruption?
The third explosion is thought to be the loudest
sound in history. The ash from the eruption
changed global weather patterns for several years.